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  • T-cell memory is very important for long-lasting immunity, because T-cells control both humoral and cell mediated immunity.When the immune system recognizes a foreign antigen for the first time, an immune response is produced. When T cells are involved, immunological T-cell memory is produced. When the body encounters same antigen subsequently, a stronger immune response is produced. This is because of existing immunological memory against that antigen. Further antigenic stimulus increases the immune response. First antigenic stimulus is "priming"whereas subsequent stimuli are "booster". This is the principle of active immunization.
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The administration of treated microorganisms or material from a pathogen into humans or animals to induce an immune response?

vaccine


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